JP2013156002A - Refrigeration system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve various problems due to delay in initial rise in starting an operation and dew condensation, as in a conventional adsorption type heat pump, dew condensation is found on an adsorbent and an adsorption core adsorbing vapor in stopping an operation.SOLUTION: A refrigeration system additionally includes a refrigerant tank 5 for recovering a refrigerant inside of a refrigeration cycle in stopping an operation to prevent dew condensation inside of the refrigeration cycle, a solenoid opening/closing valve 6 opened in returning the refrigerant from the refrigeration cycle to the refrigerant tank 5, a solenoid pressure equalizing valve 7 opened in returning the refrigerant from the inside of the refrigeration cycle to the refrigerant tank 5 to equalize a pressure in an evaporator 4 and a pressure in the refrigerant tank 5, and an electric heater 8 for heating the refrigerant in the refrigerant tank 5 to make the pressure in the refrigerant tank 5 higher than that in the evaporator 4 in returning the refrigerant from the refrigerant tank 5 to the refrigeration cycle in starting an operation.

Description

  The present invention relates to an adsorption refrigeration system that obtains refrigeration capacity by latent heat of vaporization when gaseous refrigerant (refrigerant vapor) is adsorbed to an adsorbent of an adsorbing core and the refrigerant evaporates, and in particular, a refrigerant such as water circulates. Concerning anti-condensation measures after shutdown in the refrigeration cycle.

Conventionally, as a refrigeration system, for example, an adsorption heat pump that evaporates a refrigerant having a low vapor pressure such as water and a large latent heat of evaporation with an evaporator and exhibits a refrigerating capacity by the latent heat of evaporation is known.
This adsorption heat pump is composed of an adsorber that stores an adsorption core that is a heat exchanger filled with an adsorbent that adsorbs the vapor (water vapor) of the refrigerant evaporated in the evaporator, and an adsorption core that desorbs the refrigerant vapor. And a condenser for condensing and liquefying the water vapor.
As the adsorbent, silica gel or the like that adsorbs the vapor of the refrigerant that is, for example, water vapor in the adsorption process and takes away the amount of heat from the heating medium that is, for example, hot water flowing in the pipe in the desorption process, or vaporizes the adsorbed refrigerant. Zeolite and the like are used.
In the adsorption heat pump, a part of the refrigerant vaporized by the adsorption core is condensed on the inner wall of the adsorber to cause dew condensation, which is a factor of reducing the heat pump efficiency.

  Therefore, as shown in the adsorption heat pump described in Patent Document 1, the main purpose is to prevent water vapor adsorbed on the adsorption core of the adsorber from adhering (condensation) to the case or the like. We are trying to take measures by heat insulation to prevent the refrigerant from condensing. However, in the adsorption heat pump described in Patent Document 1, an attempt is made to solve the problem of refrigerant evaporation from the case portion that does not contribute to cooling when the refrigerant evaporates, resulting in loss. Therefore, there is a problem that it is insufficient as a countermeasure against condensation.

By the way, an adsorber that contains an adsorbing core filled with an adsorbent that adsorbs and desorbs refrigerant, a condenser that cools and condenses the refrigerant from which the adsorbing core has been desorbed, and evaporates the refrigerant liquefied by the condenser. A refrigeration system (adsorption refrigeration apparatus) having a refrigeration cycle in which evaporators that exhibit refrigeration capacity are sequentially connected by piping to circulate refrigerant is known.
Inside the refrigeration system, there is an environment where there is more refrigerant than the adsorbent can adsorb, and if the refrigeration system is left after the operation is stopped, the temperature of the internal equipment will be higher than the temperature outside the refrigeration system (external temperature). When the temperature becomes low, water vapor is condensed everywhere, and water vapor other than the amount that can be adsorbed by the adsorbent is also condensed around.
On the other hand, when operation is started in this state, when desorbing moisture from the adsorbent, it is necessary to evaporate the condensed moisture in addition to the moisture desorbing from the adsorbent, which requires more heat and time. Thus, the rise at the start of the operation of the refrigeration system is a factor.

JP 2010-078182 A

  An object of the present invention is to provide a refrigeration system capable of preventing condensation inside the refrigeration cycle. It is another object of the present invention to provide a refrigeration system that can suppress a delay in rising at the start of operation.

The invention (refrigeration system) described in claim 1 includes an adsorber that houses an adsorbing core provided with an adsorbent that adsorbs and desorbs the refrigerant, and a condenser that cools and condenses the refrigerant from which the adsorbing core has been desorbed. And an evaporator that evaporates the refrigerant liquefied by the condenser and exerts a refrigerating capacity.
The refrigeration system has a refrigeration cycle having a refrigerant supply path for supplying refrigerant from the evaporator through the adsorber to the condenser, and is positioned so as to be positioned below the gravity direction lowermost part of the refrigeration cycle. A refrigerant tank capable of collecting a predetermined amount of refrigerant in the cycle, a refrigerant recovery means for executing refrigerant recovery control for recovering refrigerant in the refrigeration cycle to the refrigerant tank, and controlling the operation of the refrigerant recovery means when the refrigeration system is stopped. Refrigerant recovery control means.

According to the first aspect of the present invention, the refrigerant recovery control is executed by controlling the operation of the refrigerant recovery means when the operation of the refrigeration system is stopped.
When the operation of the refrigerant recovery means, that is, the refrigerant recovery control is started (implemented), the refrigerant existing in the refrigeration cycle (for example, the refrigerant in the refrigerant supply path, the refrigerant in the evaporator, and the refrigerant in the condenser) evaporates. Flows into the refrigerant tank from the lowest part in the gravity direction of the vessel or from the refrigerant supply pipe through the first communication pipe.
Thereby, since the refrigerant in the refrigeration cycle is collected in the refrigerant tank, the refrigerant in the refrigeration cycle can be stored in the refrigerant tank.
As a result, during operation of the refrigeration system, if there is more refrigerant in the refrigeration cycle than the amount of adsorbent that can be adsorbed, or after the refrigeration system stops operating, the temperature of the internal equipment becomes lower than the external temperature. Even in this case, the refrigerant in the refrigeration cycle can be collected in the refrigerant tank, so that there is no refrigerant in the refrigeration cycle.
Therefore, refrigerant condensation (condensation) inside the refrigeration cycle when the operation of the refrigeration system is stopped can be prevented, so that a delay in rising at the start of operation of the refrigeration system can be suppressed.

According to invention of Claim 2, the evaporator is arrange | positioned so that the gravity direction lowermost part may be located below a gravity direction lower than the gravity direction lowermost part of a condenser.
Further, the refrigerant tank is arranged such that the refrigerant liquid level when the refrigerant recovery control is completed is located below the gravity direction lowermost part of the evaporator in the gravity direction.
According to invention of Claim 3, the refrigerating cycle has a refrigerant | coolant supply piping which supplies a refrigerant | coolant from a condenser to an evaporator.

  According to the fourth aspect of the present invention, the refrigerant recovery means is a first communication pipe that connects the refrigerant cooling means for cooling the refrigerant in the condenser, the refrigerant supply pipe, or the lowermost portion in the gravity direction of the evaporator and the refrigerant tank. And a second communication pipe that communicates the refrigerant tank and the evaporator, a first on-off valve that opens and closes the first communication pipe, and a second on-off valve that opens and closes the second communication pipe. For example, when the refrigerant recovery control is executed after the operation of the refrigeration system is stopped, the operation of the refrigerant cooling means is controlled (operated), and the operation of the first and second on-off valves is controlled (opened), whereby the refrigeration cycle. The refrigerant inside is collected in the refrigerant tank.

According to the fifth aspect of the present invention, the refrigerant desorption control is executed by controlling the operation of the refrigerant desorption means before the refrigerant recovery control. Thereby, the refrigerant is desorbed from the adsorption core, and the desorbed refrigerant is supplied to the condenser.
According to the sixth aspect of the present invention, the refrigerant desorption means has a heating medium supply means for supplying a heating medium for heating the adsorption core into the adsorber, and a refrigerant cooling means for cooling the refrigerant in the condenser. doing. For example, when the refrigerant desorption control is executed before the refrigerant recovery control when the refrigeration system is stopped, the refrigerant is desorbed from the adsorption core by controlling (operating) the operation of the heating medium supply unit and the refrigerant cooling unit. The desorbed refrigerant is cooled by the condenser and condensed.

According to the seventh aspect of the invention, the refrigerant charging control is executed by controlling the operation of the refrigerant charging means at the start of operation of the refrigeration system.
When the operation of the refrigerant charging means, that is, the refrigerant charging control is started (implemented), the pressure in the refrigerant tank becomes higher than the pressure in the evaporator. Thus, when the pressure in the refrigerant tank becomes higher than the pressure in the evaporator, the liquid refrigerant in the refrigerant tank is pushed out to the refrigerant supply pipe through the first communication pipe and flows into the evaporator.
As a result, the liquid refrigerant in the refrigerant tank is returned to the evaporator having a lower pressure than the refrigerant tank, so that the refrigerant in the refrigerant tank is filled in the refrigeration cycle without remaining in the refrigerant tank. Therefore, the refrigerant charging amount in the refrigeration cycle is not insufficient, and a decrease in the refrigeration capacity of the refrigeration cycle can be prevented.

According to an eighth aspect of the present invention, the refrigerant filling means includes a heating medium supply means for supplying a heating medium for heating the adsorption core into the adsorber, and a cooling for supplying a cooling medium for cooling the adsorption core into the adsorber. A medium supply means, a refrigerant cooling means for cooling the refrigerant in the condenser, a refrigerant heating means for heating the refrigerant in the refrigerant reservoir, a refrigerant supply pipe or a first communication pipe that communicates the lowest part in the gravity direction of the evaporator with the refrigerant tank And a first on-off valve for opening and closing the first communication pipe. For example, when the refrigerant charging control is executed at the start of the operation of the refrigeration system, the operations of the heating medium supply unit, the cooling medium supply unit, the refrigerant cooling unit, and the refrigerant heating unit are controlled (operated) and the operation of the first on-off valve is controlled. By controlling (opening), the refrigerant in the refrigerant tank is filled into the refrigeration cycle.
According to the ninth aspect of the present invention, the heating medium used in the heating medium supply means is used as the heating source of the refrigerant heating means. An electric heater that heats the refrigerant in the refrigerant tank when supplied with electric power may be used as the refrigerant heating means.

The invention according to claim 10 (refrigeration system) includes an adsorber containing an adsorbing core provided with an adsorbent for adsorbing and desorbing refrigerant, and condensation for cooling and condensing the refrigerant from which the adsorbing core has been desorbed. And an evaporator that evaporates the refrigerant liquefied by the condenser and exerts a refrigerating capacity.
The condenser is disposed so as to be positioned below the gravity direction lowermost part of the evaporator in the gravity direction, and has a refrigerant storage part capable of recovering a predetermined amount of refrigerant in the refrigeration cycle.
The refrigeration system includes a refrigeration cycle having a refrigerant supply path for supplying refrigerant from the evaporator to the condenser via the adsorber, and refrigerant recovery means for executing refrigerant recovery control for recovering the refrigerant in the refrigeration cycle to the refrigerant storage unit. The refrigerant recovery control means controls the operation of the refrigerant recovery means when the operation of the refrigeration system is stopped.

According to the invention described in claim 10, the refrigerant recovery control is executed by controlling the operation of the refrigerant recovery means when the operation of the refrigeration system is stopped.
When the operation of the refrigerant recovery means, that is, the refrigerant recovery control is started (implemented), the refrigerant existing in the refrigeration cycle (for example, the refrigerant in the refrigerant supply path, the refrigerant in the evaporator, and the refrigerant in the condenser) evaporates. It flows into the refrigerant | coolant storage part of a condenser through the 1st communicating pipe from the gravity direction lowermost part of a condenser. Alternatively, the refrigerant staying in the refrigerant supply path of the refrigeration cycle flows into the refrigerant storage section of the condenser. As a result, the refrigerant in the refrigeration cycle is collected in the refrigerant storage part of the condenser, so that the refrigerant in the refrigeration cycle can be stored in the condenser.
As a result, during operation of the refrigeration system, if there is more refrigerant in the refrigeration cycle than the amount of adsorbent that can be adsorbed, or after the refrigeration system stops operating, the temperature of the internal equipment becomes lower than the external temperature. Even in this case, the refrigerant in the refrigeration cycle (evaporator or adsorber) can be recovered in the condenser, so that no refrigerant exists in the refrigeration cycle.
Therefore, refrigerant condensation (condensation) inside the refrigeration cycle when the operation of the refrigeration system is stopped can be prevented, so that a delay in rising at the start of operation of the refrigeration system can be suppressed.

According to the eleventh aspect of the invention, the refrigerant storage part of the condenser is arranged such that the refrigerant liquid level when the refrigerant recovery control is completed is located below the gravity direction lowermost part of the evaporator in the gravity direction. Has been.
According to the twelfth aspect of the present invention, the refrigerant recovery means includes a refrigerant cooling means for cooling the refrigerant in the condenser, a first communication pipe that connects the refrigerant reservoir and the evaporator, and the condenser and the evaporator. A second communication pipe that communicates, a first on-off valve that opens and closes the first communication pipe, and a second on-off valve that opens and closes the second communication pipe. For example, when the operation of the refrigeration system is stopped, the operation of the refrigerant cooling means is controlled (operated), and the operation of the first and second on-off valves is controlled (opened), so that the refrigerant in the refrigeration cycle is collected in the refrigerant tank. Is done.

According to the thirteenth aspect of the present invention, the refrigerant desorption control is executed by controlling the operation of the refrigerant desorption means before the refrigerant recovery control. Thereby, the refrigerant is desorbed from the adsorption core, and the desorbed refrigerant is supplied to the condenser.
According to the invention described in claim 14, the refrigerant desorbing means has a heating medium supply means for supplying a heating medium for heating the adsorption core into the adsorber, and a refrigerant cooling means for cooling the refrigerant in the condenser. doing. For example, when the refrigerant desorption control is executed before the refrigerant recovery control when the refrigeration system is stopped, the refrigerant is desorbed from the adsorption core by controlling (operating) the operation of the heating medium supply unit and the refrigerant cooling unit. The desorbed refrigerant is cooled by the condenser and condensed.

According to the fifteenth aspect of the invention, the refrigerant charging control is executed by controlling the operation of the refrigerant charging means at the start of operation of the refrigeration system.
When the operation of the refrigerant charging means, that is, the refrigerant charging control is started (implemented), the pressure in the condenser becomes higher than the pressure in the evaporator. Thus, when the pressure in the condenser becomes higher than the pressure in the evaporator, the liquid refrigerant in the refrigerant reservoir of the condenser flows into the evaporator through the first communication pipe. Thereby, the liquid refrigerant in the condenser is returned to the evaporator having a pressure lower than that of the condenser, so that the refrigerant in the refrigerant reservoir is filled in the refrigeration cycle without remaining in the refrigerant reservoir. Therefore, the refrigerant charging amount in the refrigeration cycle is not insufficient, and a decrease in the refrigeration capacity of the refrigeration cycle can be prevented.

According to the sixteenth aspect of the present invention, the refrigerant filling means is a heating medium supply means for supplying a heating medium for heating the adsorption core into the adsorber, and a cooling for supplying a cooling medium for cooling the adsorption core into the adsorber. It has a medium supply means, a refrigerant cooling means for cooling the refrigerant in the condenser, a first communication pipe that communicates the refrigerant reservoir and the evaporator, and a first on-off valve that opens and closes the first communication pipe. For example, when the refrigerant charging control is executed at the start of operation of the refrigeration system, the operations of the heating medium supply unit, the cooling medium supply unit and the refrigerant cooling unit are controlled (operated) and the operation of the first on-off valve is controlled (opened) ), The refrigerant in the refrigerant reservoir of the condenser is charged into the refrigeration cycle, particularly the evaporator.
According to the invention described in claim 17, the adsorber has the adsorption core heating means for heating the adsorption core so that the temperature of the adsorption core is higher than the outside air temperature.
According to the eighteenth aspect of the present invention, the adsorption core has an adsorption capacity equal to or greater than the amount of remaining refrigerant remaining inside the refrigeration cycle when the refrigerant recovery control is completed.

FIG. 1 is a configuration diagram illustrating a refrigeration system including a refrigeration cycle (Example 1). 6 is a flowchart illustrating a control method of refrigerant recovery operation (Example 1). 6 is a flowchart showing a control method of the refrigerant charging operation (Example 1). (Example 2) which is the block diagram which showed the refrigerating system provided with the refrigerating cycle. (Example 3) which is the block diagram which showed the refrigerating system provided with the refrigerating cycle.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
The present invention aims to prevent refrigerant condensation (condensation) inside the refrigeration cycle when the operation of the refrigeration system is stopped, and collects the refrigerant in the refrigeration cycle in the refrigerant reservoir of the tank or condenser when the operation of the refrigeration system is stopped. It was realized by doing.
In addition, when the operation of the refrigeration system was stopped, it was realized by collecting the refrigerant that could not adsorb the adsorbent.
In addition, when the operation of the refrigeration system is started, the refrigeration cycle or the evaporator is filled with the refrigerant in the refrigerant storage unit of the refrigerant tank or the condenser.

[Configuration of Example 1]
1 to 3 show a first embodiment of the present invention.

An adsorption refrigeration system (hereinafter referred to as a refrigeration system) of the present embodiment is an adsorption type in which two first and second adsorbers 1 and 2, a condenser 3 and an evaporator 4 are sequentially connected in a pipe to circulate a refrigerant. And a refrigeration cycle (hereinafter referred to as a refrigeration cycle).
The two first and second adsorbers 1 and 2 are filled with an adsorbent that absorbs gaseous refrigerant (gas refrigerant, refrigerant vapor) when cooled and desorbs refrigerant when heated. 1 and the 2nd adsorption | suction core 1a, 2a are each accommodated.

In the refrigeration system, the adsorbent adsorbs ambient vapor, whereby the refrigerant in the liquid state (liquid refrigerant, liquid refrigerant) in the evaporator 4 evaporates, and heat is generated from the fluid flowing in the evaporator 4 during the evaporation. It is configured to take away cold water.
The refrigeration system includes a heating medium or a cooling medium supply means for supplying a heating medium or a cooling medium into each of the first and second adsorbers 1 and 2, a cooling water supply means for supplying cooling water into the condenser 3, A basic system is constituted by the heat exchange medium supply means for supplying the heat exchange medium into the evaporator 4 and the above-described refrigeration cycle, and refrigerant and cooling during normal operation are possible.

In the present embodiment, a refrigerant tank (refrigerant recovery unit) 5 that recovers refrigerant in the refrigeration cycle when the operation of the refrigeration system is stopped, an electromagnetic on-off valve 6 that opens when the refrigerant is returned to the refrigerant tank 5, and an electromagnetic equalization valve. A pressure valve 7 is incorporated. In addition, an electric heater 8 that is energized and controlled when returning the refrigerant to the refrigeration cycle is installed inside the refrigerant tank 5.
The electromagnetic on-off valve 6, the electromagnetic pressure equalizing valve 7, and the electric heater 8 are configured to be controlled by an air conditioning control device (electronic control device: hereinafter referred to as an air conditioning ECU) 10 that includes an electromagnetic valve drive circuit, a heater drive circuit, and the like. Has been.

The refrigeration system includes refrigerant recovery means for performing refrigerant recovery control for recovering refrigerant in the refrigeration cycle to the refrigerant tank 5, and refrigerant desorption control for desorbing refrigerant vapor from the first and second adsorption cores 1a and 2a. Refrigerant desorbing means for executing and refrigerant filling means for executing refrigerant charging control for charging the refrigerant in the refrigerant tank 5 into the refrigeration cycle are provided.
In the refrigeration system, the operation of the heating medium or cooling medium supply means, the cooling water supply means, the heat exchange medium supply means, the refrigerant recovery means, the refrigerant desorption means, and the refrigerant filling means is performed by a drive circuit of a control device for the refrigeration cycle. It is comprised so that it may be controlled by air-conditioning ECU10 comprised.

The refrigeration cycle includes a gas (vapor) refrigerant pipe extending from the first and second outlet ports of the evaporator 4 to the inlet port of the condenser 3 and a liquid refrigerant pipe extending from the outlet port of the condenser 3 to the inlet port of the evaporator 4. And.
The gas refrigerant pipe is a gas refrigerant supply path for supplying refrigerant vapor from the evaporator 4 to the condenser 3 through the two first and second adsorbers 1 and 2, and is connected to the first outlet port of the evaporator 4. From the supply pipe 11 for supplying the refrigerant vapor to the inlet port of the first adsorber 1, the supply pipe 12 connecting the outlet port of the first adsorber 1 and the first junction, and the second outlet port of the evaporator 4 Supply pipe 13 for supplying refrigerant vapor to the inlet port of the adsorber 2, supply pipe 14 connecting the outlet port of the second adsorber 2 and the second junction, and a condenser from the first junction and the second junction Supply pipes 15 and 16 for supplying refrigerant vapor to the three inlet ports.

The supply pipe 11 is a first flow path pipe that communicates the first outlet port of the evaporator 4 and the inlet port of the first adsorber 1. The supply pipes 12, 15, and 16 are first flow path pipes that connect the outlet port of the first adsorber 1 and the inlet port of the condenser 3 via the first junction.
The supply pipe 13 is a second flow path pipe that communicates the second outlet port of the evaporator 4 and the inlet port of the second adsorber 2. The supply pipe 14 is a second flow path pipe that communicates the outlet port of the second adsorber 2 and the inlet port of the condenser 3 via the first junction.
The liquid refrigerant pipe is a liquid refrigerant supply path for supplying the liquid refrigerant from the condenser 3 to the condenser 3, and communicates with the outlet port of the condenser 3 and the inlet port of the evaporator 4 to evaporate from the condenser 3. A supply pipe 18 for supplying the liquid refrigerant to the container 4 is provided.

A steam valve with a check valve structure (hereinafter referred to as a check valve) that opens when the pressure on the evaporator side rises above a predetermined value (higher than the pressure on the first adsorber side) in the middle of the supply pipe 11. ) 21 is installed. The check valve 21 allows the refrigerant to flow from the evaporator 4 to the first adsorber 1 and prevents the reverse flow of the refrigerant from the first adsorber 1 to the evaporator 4 in the supply pipe 11.
A steam valve with a check valve structure (hereinafter referred to as a check valve) that opens when the pressure on the first adsorber side rises above a predetermined value (higher than the pressure on the condenser side) in the middle of the supply pipe 12. ) 22 is installed. The check valve 22 allows the refrigerant to flow from the first adsorber 1 to the condenser 3 and prevents the refrigerant from flowing backward from the condenser 3 to the first adsorber 1 in the supply pipe 12.

A steam valve with a check valve structure (hereinafter referred to as a check valve) that opens when the pressure on the evaporator side rises above a predetermined value (higher than the pressure on the second adsorber side) in the middle of the supply pipe 13. ) 23 is installed. The check valve 23 allows the refrigerant to flow from the evaporator 4 to the second adsorber 2 and prevents the reverse flow of the refrigerant from the second adsorber 2 to the evaporator 4 in the supply pipe 13.
A steam valve with a check valve structure (hereinafter referred to as a check valve) that opens when the pressure on the second adsorber side rises above a predetermined value (higher than the pressure on the condenser side) in the middle of the supply pipe 14. ) 24 is installed. The check valve 24 allows the refrigerant to flow from the second adsorber 2 to the condenser 3 and prevents the refrigerant from flowing backward from the condenser 3 to the second adsorber 2 in the supply pipe 14.

The check valves 21 to 24 include a housing having a valve seat (valve seat) in which a flow path hole (valve hole) is formed, a valve that opens and closes the flow path hole, and biases the valve in a valve closing direction. And a spring.
The check valves 21 to 24 are opened and closed by a pressure difference among the first and second adsorbers 1 and 2, the condenser 3 and the evaporator 4 to control the flow of the refrigerant in the refrigeration cycle.

The two first and second adsorbers 1 and 2 are cases (containers) in which the first and second adsorption cores 1a and 2a are housed.
The inlet port of the first adsorber 1 is connected to the first outlet port of the evaporator 4 via a supply pipe 11. The outlet port of the first adsorber 1 is connected to the inlet port of the condenser 3 via supply pipes 12, 15 and 16.
The inlet port of the second adsorber 2 is connected to the second outlet port of the evaporator 4 via a supply pipe 13. The outlet port of the second adsorber 2 is connected to the inlet port of the condenser 3 via supply pipes 14, 15 and 16.

The first and second adsorbing cores 1a and 2a include a plurality of tubes through which the heating medium or the cooling medium flows, header tanks in which one end of these tubes is joined to distribute or collect the heating medium or the cooling medium, and each tube It is constituted by a known heat exchanger having a large number of fins and the like bonded to the surface thereof, and a large number of adsorbents bonded to the surface of the heat exchanger such as tubes and fins of the heat exchanger.
The adsorbent constitutes a trapping material that captures (adsorbs) the refrigerant vapor when cooled and dissociates (desorbs) the refrigerant adsorbed when heated.

In this embodiment, as the adsorbent, for example, a skeleton made of aluminum oxide, phosphoric acid or silicic acid, zeolite, silica gel, activated alumina or activated carbon is employed.
Here, by supplying a heating medium to the first and second adsorption cores 1a and 2a, the refrigerant adsorbed by the adsorbent of the first and second adsorption cores 1a and 2a is desorbed and released as vapor. .
In consideration of the amount of refrigerant remaining in the refrigeration system, the adsorbent amounts of the two first and second adsorbing cores 1 and 2 are desirably adjusted to an amount that can be adsorbed at a minimum.

The condenser 3 is a refrigerant condensing unit that condenses and liquefies the refrigerant vapor by cooling the refrigerant vapor desorbed from the adsorbents of the first and second adsorption cores 1a and 2a.
An inlet port that opens at the top surface of the condenser 3 is formed at the top of the condenser 3, and an outlet port that opens at the bottom surface of the condenser 3 is formed at the bottom of the condenser 3. . The inlet port of the condenser 3 is connected to the outlet port of the first adsorber 1 and the outlet port of the second adsorber 2 via supply pipes 12 and 14 to 16. Further, the outlet port of the condenser 3 is connected to the inlet port of the evaporator 4 via a supply pipe 18.
In addition, a heat exchanger (heat exchange tube) 25 in which cooling water is circulated and supplied from the cooling water supply means is accommodated in the condenser 3. As a result, the refrigerant vapor supplied to the condenser 3 is condensed by being cooled by the heat exchanger 25, becomes a liquid refrigerant, and is temporarily stored in the lowest part in the gravity direction of the condenser 3, and then evaporated. Return to vessel 4.

In the evaporator 4, the first and second adsorption cores 1 a and 2 a adsorb the refrigerant vapor and exhibit a refrigerating capacity (cooling capacity) by latent heat of evaporation when the refrigerant evaporates and vaporizes.
An inlet port that opens at the side of the evaporator 4 is formed below the side of the evaporator 4, and two first openings that are opened at the upper surface of the condenser 3 are formed at the top of the evaporator 4. The second outlet ports are formed at a predetermined distance. The inlet port of the evaporator 4 is connected to the outlet port of the condenser 3 via a supply pipe 18. Further, the first outlet port of the evaporator 4 is connected to the inlet port of the first adsorber 1 via the supply pipe 11. Further, the second outlet port of the evaporator 4 is connected to the inlet port of the second adsorber 2 via the supply pipe 13.
Further, inside the evaporator 4 is housed a heat exchanger (heat exchange tube) 26 to which cold water is circulated and supplied from the heat exchange medium supply means. Thereby, when the liquid refrigerant in the evaporator 4 evaporates, heat is taken from the heat exchange medium (fluid) flowing through the heat exchanger 26 to generate cold water.

Here, as the heating medium for heating the first and second adsorption cores 1a, 2a, for example, hot water supplied from a hot water tank is used.
Moreover, as a cooling medium which cools the 1st, 2nd adsorption | suction core 1a, 2a, the cooling water supplied, for example from a cooling water tank is used.
Moreover, as a cooling medium for cooling the refrigerant vapor in the condenser 3, for example, cooling water supplied from an air-cooled radiator is used.
Moreover, as the heat exchange medium cooled by the latent heat of evaporation when the refrigerant evaporates, cold water circulating between the indoor heat exchanger of the vehicle air conditioner or the stationary air conditioner and the evaporator is used. . By the way, the indoor heat exchanger is disposed in an air conditioning duct (not shown) that forms a passage for conditioned air, and a blower (not shown) is installed on the upstream side of the airflow direction of the air conditioning duct. Yes. The warm water, cooling water, and cold water are all fluids obtained by mixing water with an ethylene glycol antifreeze.

Next, details of the heating medium or cooling medium supply means of the present embodiment will be described with reference to FIG. The heating medium or cooling medium supply means has a hot water circulation path for circulating and supplying hot water for heating the adsorbent of the first adsorbing core 1a or the adsorbent of the second adsorbing core 2a to the first adsorber 1 or the second adsorber 2. A cooling water circulation path for supplying hot water for cooling the adsorbent of the first adsorption core 1a or the adsorbent of the second adsorption core 2a to the first adsorber 1 or the second adsorber 2, a hot water circulation path, and a cooling water circulation path And a path switching means for switching between.
The path switching means is an electromagnetic switching valve (hereinafter referred to as the first four-way valve) that switches between the inlet pipe of the first adsorption core 1a or the inlet pipe of the second adsorption core 2a and the hot water introduction pipe of the hot water circulation path or the cooling water introduction pipe of the cooling water circulation path. Valve) 27 and an electromagnetic switching valve (hereinafter referred to as a second four-way valve) for switching between the outlet pipe of the first adsorption core 1a or the outlet pipe of the second adsorption core 2a and the hot water outlet pipe of the hot water circulation path or the cooling water outlet pipe of the cooling water circulation path. Valve) 28.

In the present embodiment, when the two first and second four-way valves 27 and 28 are both set to the first position, the cooling water flows through the first adsorption core 1a and the hot water flows through the second adsorption core 2a. A mode is formed. When both the first and second four-way valves 27 and 28 are set to the second position, a second mode is formed in which hot water flows through the first adsorption core 1a and cooling water flows through the second adsorption core 2a. Is done.
The two first and second four-way valves 27 and 28 are energized and controlled by the air conditioning ECU 10.
When the first and second four-way valves 27 and 28 are respectively set to the solid line positions in FIG. 1, the first adsorption core 1a and the cooling water circulation path are connected, and the second adsorption core 2a and the hot water circulation path are connected. Is done. Thereby, the cooling water which flows through a cooling water circulation path is directly supplied into the inside of the 1st adsorption core 1a, and the adsorption agent of the 1st adsorption core 1a is cooled. Moreover, the hot water flowing through the hot water circulation path is directly supplied into the second adsorption core 2a, and the adsorbent of the second adsorption core 2a is heated.

Further, when the first and second four-way valves 27 and 28 are respectively set at the positions of the broken lines in FIG. 1, the first adsorption core 1a and the hot water circulation path are connected, and the second adsorption core 2a and the cooling water circulation path are connected. Is connected. Thereby, the warm water flowing through the warm water circulation path is directly supplied to the inside of the first adsorption core 1a, and the adsorbent of the first adsorption core 1a is heated. Further, the cooling water flowing through the cooling water circulation path is directly supplied to the inside of the second adsorption core 2a to cool the adsorbent of the second adsorption core 2a.
The heating medium or the cooling medium supply means includes an electric hot water pump 31 that receives electric power to generate a hot water flow in the hot water circulation path, and an electric motor that generates electric power to generate a cooling water flow in the cooling water circulation path. And a cooling water pump 32.
The electric hot water pump 31 and the electric cooling water pump 32 are both motor-driven water (fluid) pumps and are energized and controlled by the air conditioning ECU 10.

Next, details of the cooling water supply means and the heat exchange medium supply means of this embodiment will be described with reference to FIG.
The cooling water supply means includes a cooling water circulation path that circulates cooling water from the radiator to the heat exchanger 25 inside the condenser 3, and an electric cooling water pump that generates a cooling water flow in the cooling water circulation path upon receiving power supply. 33.
The heat exchanger 25 and the electric cooling water pump 33 constitute refrigerant cooling means for cooling the refrigerant in the condenser 3.

The heat exchange medium supply means includes a cold water circulation path that circulates cold water from the indoor heat exchanger to the heat exchanger 26 inside the evaporator 4, and electric cold water that generates a cold water flow in the cold water circulation path when supplied with electric power. And a pump 34.
The electric cooling water pump 33 and the electric cooling water pump 34 are both motor-driven water pumps and are energized and controlled by the air conditioning ECU 10.
Instead of the heat exchanger 25, a refrigerant cooling means such as a cooling fan for blowing cooling air to the condenser 3 may be provided. Further, the electric cooling water pump 32 described above is used as a cooling water pump, a heat exchanger 25 is provided in the middle of the bypass flow path connected to the cooling water circulation path of the cooling medium supply means, and the flow path opens and closes the bypass flow path. An on-off valve may be provided.

[Features of Example 1]
Next, the characteristics of the refrigeration system of this embodiment and the details of the refrigerant tank 5 will be described with reference to FIG.

The refrigeration system includes a refrigerant tank 5, an electromagnetic on-off valve 6, an electromagnetic pressure equalizing valve 7, and an electric heater 8 in addition to the basic system.
The evaporator 4 is disposed such that the lowermost portion in the gravity direction (the bottom surface of the evaporator 4) is positioned below the lowermost portion in the gravity direction of the condenser 3 (the bottom surface of the condenser 3).
The refrigerant tank 5 is installed so as to be positioned below the refrigeration cycle in the direction of gravity. Specifically, the refrigerant tank 5 is arranged so that the liquid refrigerant surface when the refrigerant recovery control is completed is located below the bottom surface of the evaporator 4 in the direction of gravity.
The refrigerant tank 5 is a liquid tank that stores liquid refrigerant when the operation of the refrigeration system is stopped, and has a refrigerant storage unit 36 that can collect a predetermined amount of refrigerant in the refrigeration cycle. The refrigerant reservoir 36 is provided on the bottom surface, which is the lowest part in the gravity direction of the refrigerant tank 5. The refrigerant tank 5 has an internal volume capable of storing a predetermined amount of refrigerant containing refrigerant vapor. Thereby, a gas phase space in which the refrigerant vapor stays is formed above the liquid level of the refrigerant collected in the refrigerant reservoir 36.

  Next, details of the refrigerant recovery means, the refrigerant desorption means, and the refrigerant filling means of this embodiment will be described with reference to FIG.

The refrigerant recovery means includes the supply pipe 18, the electromagnetic on-off valve 6 and the electromagnetic pressure equalizing valve 7, the first and second four-way valves 27 and 28, the electric hot water pump 31, the electric cooling water pump 32, the electric cooling water pump 33 and the electric cold water. A control device such as a pump 34, a pipe (first communication pipe) 41 that communicates the lowermost part of the supply pipe 18 in the direction of gravity and the refrigerant tank 5, and a pipe that communicates the refrigerant tank 5 and the evaporator 4 (second communication). Tube) 42.
The refrigerant desorption means includes supply pipes 11 to 16, supply pipe 18, first and second four-way valves 27 and 28, electric hot water pump 31, electric cooling water pump 32, electric cooling water pump 33, and electric cold water pump 34. ing.
The refrigerant charging means includes a supply pipe 18, an electromagnetic on-off valve 6, an electromagnetic pressure equalizing valve 7, and an electric heater 8, first and second four-way valves 27 and 28, an electric hot water pump 31, an electric cooling water pump 32, and an electric cooling water pump. 33 and a control device such as an electric cold water pump 34, a pipe 41, and a pipe 42.

The pipe 41 supplies the first refrigerant recovery path for supplying the liquid refrigerant flowing out of the condenser 3 to the refrigerant storage section 36 of the refrigerant tank 5 and the liquid refrigerant flowing out of the evaporator 4 to the refrigerant storage section 36 of the refrigerant tank 5. The second refrigerant recovery path is configured.
The first refrigerant recovery path includes a flow path formed in the supply pipe 18 communicating with the bottom surface (exit port) of the condenser 3 and a flow path formed in the pipe 41. Further, the second refrigerant recovery path is configured by a flow path formed in the supply pipe 18 communicating with the bottom surface (inlet port) of the evaporator 4 and a flow path formed in the pipe 41.
In the pipe 42, a pressure equalizing flow path that connects the gas phase space in the refrigerant tank 5 and the gas phase space in the evaporator 4 is formed.

In the middle of the pipe 41, a normally closed electromagnetic on-off valve (first on-off valve) 6 that opens when supplied with electric power is installed.
The electromagnetic on-off valve 6 includes a housing having a valve seat (valve seat) in which a flow path hole (valve hole communicating with the flow path formed in the pipe 41) is formed, and a valve for opening and closing the flow path hole. And a spring for urging the valve in the valve closing direction, and an electromagnetic actuator for driving the valve in the valve opening direction. The electromagnetic actuator includes a solenoid having a coil that generates a magnetic force when energized.
When the solenoid coil is energized (turned on), the electromagnetic on-off valve 6 is detached from the valve seat and opens the valve hole (fully opened). Further, when the energization to the solenoid coil is stopped (off), the solenoid on-off valve 6 is seated on the valve seat and closes (fully closes) the valve hole.

In the middle of the pipe 42, a normally closed electromagnetic pressure equalizing valve (second on-off valve) 7 that is opened when supplied with electric power is installed.
The electromagnetic pressure equalizing valve 7 includes a housing having a valve seat (valve seat) in which a flow path hole (a valve hole communicating with a flow path formed in the pipe 42) is formed, and a valve for opening and closing the flow path hole. And a spring for urging the valve in the valve closing direction, and an electromagnetic actuator for driving the valve in the valve opening direction. The electromagnetic actuator includes a solenoid having a coil that generates a magnetic force when energized.
When the solenoid coil is energized (turned on), the solenoid pressure equalizing valve 7 is detached from the valve seat and opens the valve hole (fully opened). In addition, when the energization of the solenoid coil is stopped (off), the solenoid equalizing valve 7 is seated on the valve seat and closes the valve hole (fully closed). When the electromagnetic pressure equalizing valve 7 is opened, the internal pressure of the evaporator 4 and the internal pressure of the refrigerant tank 5 are equalized.

The electric heater 8 is a refrigerant heating means that receives supply of electric power and heats the refrigerant in the refrigerant tank 5. The electric heater 8 heats the refrigerant in the refrigerant tank 5 at the start of operation of the refrigeration system, thereby making the pressure in the refrigerant tank 5 higher than the pressure in the evaporator 4. Thus, when the pressure in the refrigerant tank 5 becomes higher than the pressure in the evaporator 4, the liquid refrigerant is pushed by the pressure and flows out of the refrigerant tank 5 to the evaporator side and flows into the evaporator 4 having a low pressure. .
The electromagnetic on-off valve 6, the electromagnetic pressure equalizing valve 7, and the electric heater 8 are energized and controlled by the air conditioning ECU 10.

The air conditioning ECU 10 includes a CPU that performs control processing and arithmetic processing, a storage device (memory such as ROM and RAM) that stores various programs and various data, an input circuit (input unit), an output circuit (output unit), a power supply circuit, A microcomputer having a known structure configured to include functions such as a timer circuit and a counter is incorporated.
The sensor output signals from the liquid level sensor, the sensor output signals from various sensors, and the switch signals from various switches are A / D converted by the A / D conversion circuit and then input to the microcomputer. It is comprised so that.

Here, not only a liquid level sensor but also an indoor temperature (inside air temperature) sensor, an outdoor temperature (outside air temperature) sensor, a hot water temperature sensor, a cooling water temperature sensor, and a cold water temperature sensor are connected to the input unit of the microcomputer. Has been. Further, at least an operation switch and a temperature setting switch are connected to the input part of the microcomputer.
The air conditioning ECU 10, particularly the microcomputer, functions as a refrigerant recovery control unit that controls the operation of the refrigerant recovery unit, a refrigerant desorption control unit that controls the operation of the refrigerant desorption unit, and a refrigerant charging control unit that controls the operation of the refrigerant charging unit. It is comprised including.

When the operation switch is turned on, the air conditioning ECU 10 controls the operation of each control device (functional component) of the refrigeration system. When the refrigerant charging control is executed at the start of the operation of the refrigeration system, the electric hot water pump 31, the electric cooling water pumps 32 and 33, and the electric chilled water pump 34 are operated (on), and the normal operation of the refrigeration system is executed. At this time, the air conditioning ECU 10 executes ON-OFF switching control that repeats turning on and off of the first and second four-way valves 27 and 28 at a predetermined cycle.
The air conditioning ECU 10 performs refrigerant charging control for charging the refrigerant in the refrigerant tank 5 into the refrigeration cycle at the start of operation of the refrigeration system.
When the operation switch is turned off, the air conditioning ECU 10 stops the operation of each control device of the refrigeration system. At this time, refrigerant desorption control is performed to desorb the refrigerant from the adsorbents of the first and second adsorption cores 1a and 2a. Then, after the refrigerant desorption control, the refrigerant recovery control for recovering the refrigerant in the refrigeration cycle to the refrigerant tank 5 is executed.

[Control Method of Example 1]
Next, the control method of the refrigerator of a present Example is demonstrated easily based on FIG. 1 thru | or FIG. Here, the control routines of FIGS. 2 and 3 are repeatedly executed at predetermined control cycles during normal operation of the refrigeration system.

[When recovering refrigerant]
The air conditioning ECU 10 first determines whether or not the operation switch has been turned off, that is, whether or not the operation of the refrigeration system has stopped (step S1). If the determination result of step S1 is NO, the determination process of step S1 is repeated. Alternatively, the control routine of FIG. 2 is exited.
If the determination result in step S1 is YES, refrigerant desorption control of the first and second adsorption cores 1a and 2a is started (step S2).
At this time, the air conditioning ECU 10 operates (ON) the electric hot water pump 31, the electric cooling water pump 33, and the electric cold water pump 34. Further, the electric cooling water pump 32 and the electric heater 8 are stopped (OFF). Further, both the electromagnetic on-off valve 6 and the electromagnetic pressure equalizing valve 7 are turned off and closed. Further, the first and second four-way valves 27 and 28 are repeatedly turned on and off at a predetermined cycle.

Next, it is determined whether or not a predetermined set time has elapsed since the start of the refrigerant desorption control of the first and second adsorption cores 1a and 2a (step S3). Alternatively, it may be determined whether or not the number of switching times of the first and second four-way valves 27 and 28 has exceeded a preset number of switching times (set value). In this case, the number of switching times of the first and second four-way valves 27 and 28 is counted by a counter, and it is determined whether or not the count value exceeds a set value. If the determination result of step S3 is NO, the determination process of step S3 is repeated.
Moreover, when the determination result of step S3 is YES, refrigerant | coolant collection | recovery control is started (step S4).
At this time, the air conditioning ECU 10 operates (ON) the electric hot water pump 31 and the electric cooling water pump 33. Further, the electric cooling water pump 32, the electric cooling water pump 34, and the electric heater 8 are stopped (OFF). Further, both the electromagnetic on-off valve 6 and the electromagnetic pressure equalizing valve 7 are turned on to open. Further, ON / OFF switching control is performed on the first and second four-way valves 27 and 28.

Next, it is determined whether or not the refrigerant recovery control is complete. For example, it is determined whether or not a predetermined refrigerant recovery time has elapsed since the start of the refrigerant recovery control (step S5). If the determination result of step S5 is NO, the determination process of step S5 is repeated.
Note that it may be determined that the refrigerant recovery control has been completed when the liquid level of the refrigerant tank 5 detected by the liquid level sensor installed in the refrigerant tank 5 exceeds the set value.
Moreover, when the determination result of step S5 is YES, the functional components of the refrigeration system are stopped (OFF) (step S6). Thereafter, the control routine of FIG. 2 is exited.
At this time, the air conditioning ECU 10 turns off all of the electric hot water pump 31, the electric cooling water pump 32, the electric cooling water pump 33, the electric cold water pump 34, and the electric heater 8. Further, the first and second four-way valves 27 and 28, the electromagnetic on-off valve 6 and the electromagnetic pressure equalizing valve 7 are all turned off.

[When charging refrigerant]
The air conditioning ECU 10 determines whether or not the operation switch has been turned on at the timing when the control routine of FIG. 3 is activated, that is, determines whether or not the operation of the refrigeration system has been started (step S11). If the determination result of step S11 is NO, the determination process of step S11 is repeated. Alternatively, the control routine of FIG. 3 is exited.
Here, when the operation switch is turned on, the air conditioning ECU 10 first starts normal operation as described above. That is, the electric hot water pump 31, the electric cooling water pumps 32 and 33, and the electric cold water pump 34 are operated (turned on). Further, both the electromagnetic on-off valve 6 and the electromagnetic pressure equalizing valve 7 are turned off and closed. Further, ON / OFF switching control is performed on the first and second four-way valves 27 and 28.
Moreover, when the determination result of step S11 is YES, refrigerant | coolant filling control is started (step S12).
At this time, the air conditioning ECU 10 operates (ON) the electric heater 8. Further, the electromagnetic on-off valve 6 is turned on to open, and the electromagnetic pressure equalizing valve 7 is turned off to close.

Next, it is determined whether or not the refrigerant charging control is completed. For example, it is determined whether or not a predetermined refrigerant charging time has elapsed since the start of the refrigerant charging control (step S13). If the determination result of step S13 is NO, the determination process of step S12 or step S13 is repeated.
Note that it may be determined that the refrigerant charging control has been completed when the liquid level of the refrigerant tank 5 detected by the liquid level sensor installed in the refrigerant tank 5 becomes equal to or lower than the set value. Further, when the internal pressure of the evaporator 4 and the internal pressure of the refrigerant tank 5 are detected by the pressure sensor and the internal pressure of the evaporator 4 and the internal pressure of the refrigerant tank 5 become equal, the refrigerant charging control is completed. You may judge that
Moreover, when the determination result of step S13 is YES, refrigerant | coolant filling control is completed (step S14). Thereafter, the control routine of FIG. 3 is exited.
At this time, the air conditioning ECU 10 turns off the electric heater 8. Further, both the electromagnetic on-off valve 6 and the electromagnetic pressure equalizing valve 7 are turned off.

[Operation of Example 1]
Next, the operation of the refrigeration system of the present embodiment will be briefly described with reference to FIGS.

In the refrigeration cycle (in the system system) of the present embodiment, the non-condensable gas is discharged and the saturated vapor pressure of the refrigerant filled in the refrigeration cycle is obtained.
Here, during normal operation of the refrigeration system, the hot water is supplied to one of the two first and second adsorption cores 1a and 2a by the electric hot water pump 31 and the adsorption core is heated, so that the adsorption core is heated. The refrigerant adsorbed by the core adsorbent is desorbed and released as vapor (refrigerant vapor).

The discharged steam is supplied to the condenser 3 by opening and closing the check valve 22 or the check valve 24, and is cooled by exchanging heat with the cooling water flowing through the heat exchanger 25 in the condenser 3. The vapor refrigerant is condensed to return to the evaporator 4 as a liquid refrigerant.
On the other hand, the adsorption core from which the vapor is released adsorbs the surrounding vapor, whereby the liquid refrigerant in the evaporator 4 evaporates, and at the time of evaporation, heat is taken away from the cooling water flowing inside and the refrigerating capacity is exhibited.
As described above, in the refrigeration system of the present embodiment, during normal operation, the first adsorber 1 is a desorption process that heats the first adsorption core 1a to desorb the vapor refrigerant adsorbed on the adsorbent, A first operation mode in which the second adsorber 2 is an adsorption process for cooling the second adsorption core 2a and adsorbing the vapor refrigerant to the adsorbent, and the first adsorber 1 is the adsorption process, and the second adsorber 2 is removed. The operation is performed by switching the second operation mode as the separation process at predetermined time intervals.

When the operation stop signal of the refrigeration system is input by turning off the operation switch, the air conditioning ECU 10 first executes the refrigerant desorption control shown in the control routine of FIG.
At this time, the air conditioning ECU 10 performs ON / OFF switching control on the first and second four-way valves 27 and 28 so that only the hot water flows intermittently to the first and second adsorption cores 1a and 2a, and the electric hot water The pump 31 is turned on, and the refrigerant adsorbed by the adsorbents of the first and second adsorption cores 1a and 2a is desorbed into a gaseous state.
Further, the air conditioning ECU 10 turns off only the electric cooling water pump 32 and turns on the electric cooling water pump 33 and the electric cooling water pump 34 to cool and condense the refrigerant vapor desorbed from the adsorbent with the condenser 3. . The liquid refrigerant condensed in the condenser 3 is returned to the evaporator 4 through the supply pipe 18.
Thereafter, when the air conditioning ECU 10 determines that the refrigerant desorption control has been completed, the air conditioning ECU 10 performs ON / OFF switching control on the first and second four-way valves 27 and 28, as well as the electric hot water pump 31 and the electric cooling water pump 32. The refrigerant recovery control is executed by turning off the electric cold water pump 34 and turning on the electric cooling water pump 33.
At the start of the refrigerant recovery control, both the electromagnetic on-off valve 6 and the electromagnetic pressure equalizing valve 7 are turned ON to open the pressure in the evaporator 4 and the pressure in the refrigerant tank 5.

Here, in the refrigeration system, the bottom surface (lowermost part in the gravity direction) of the evaporator 4 is arranged at a position lower than the bottom surface (lowermost part in the gravity direction) of the condenser 3. Further, the liquid refrigerant surface that has been recovered in the refrigerant tank 5 is disposed at a position lower than the bottom surface of the evaporator 4.
As a result, the refrigerant inside the refrigeration cycle can be recovered to the refrigerant tank 5 by the head difference.
At this time, the liquid refrigerant temporarily stored in the condenser 3 is recovered from the outlet port of the condenser 3 through the supply pipe 18 → the branch part → the pipe 41 → the inlet / outlet port of the refrigerant tank 5 to the refrigerant storage part 36. The
On the other hand, the liquid refrigerant temporarily stored in the condenser 3 is recovered from the outlet port of the condenser 3 through the supply pipe 18 → the branch part → the pipe 41 → the inlet / outlet port of the refrigerant tank 5 to the refrigerant storage part 36. .
Thereafter, when the air conditioning ECU 10 determines that the refrigerant recovery control is completed, it turns off all the control devices (functional components) of the refrigeration system.

When the refrigeration system operation (startup) signal is input by turning on the operation switch, that is, when the operation of the refrigeration system is started again after the refrigerant is recovered, the air conditioning ECU 10 performs the refrigerant charging control shown in the control routine of FIG. Executed.
The air conditioning ECU 10 turns on the electromagnetic on-off valve 6 to open it, and turns on the electric heater 8 in order to make the pressure in the refrigerant tank 5 higher than the pressure in the evaporator 4. At this time, the electromagnetic pressure equalizing valve 7 is turned OFF and closed.
The liquid refrigerant stored in the refrigerant tank 5 is heated by the electric heater 8, whereby the pressure in the refrigerant tank 5 becomes higher than the pressure in the evaporator 4. Then, the refrigerant in the refrigerant tank 5 is pushed by the pressure in the gas phase space of the refrigerant tank 5, flows out from the inlet / outlet port of the refrigerant tank 5, passes through the pipe 41 and the supply pipe 18, and the evaporator 4 having a low pressure. It flows in and the cooling capacity is generated.
Thereafter, when the air conditioning ECU 10 determines that the refrigerant charging control has been completed, the air-conditioning ECU 10 turns off the electromagnetic on-off valve 6, the electromagnetic pressure equalizing valve 7, and the electric heater 8.

[Effect of Example 1]
By the way, an adsorber that contains an adsorbing core filled with an adsorbent that adsorbs and desorbs refrigerant, a condenser that cools and condenses the refrigerant from which the adsorbing core has been desorbed, and evaporates the refrigerant liquefied by the condenser. In the refrigeration system (adsorption type refrigeration apparatus) having a refrigeration cycle in which evaporators that exhibit refrigeration capacity are sequentially connected by pipes to circulate the refrigerant, the first and second adsorption cores 1a and 2a are adsorbed. If the refrigerant is filled inside the refrigeration cycle more than the agent can be adsorbed, the relative humidity in the refrigeration cycle becomes 100% when the refrigerant temperature becomes the same as each functional component after the refrigeration system is stopped. Condensation occurs inside the refrigeration cycle.
Thereby, the malfunction of the check valves 21 to 24, the performance deterioration due to the generation of hydrogen due to the contact between the material (metal used) and the condensed water used in the refrigeration cycle, the first and the second filled with the adsorbent (2) Decrease in refrigeration capacity (performance) at the start-up due to a decrease in the initial desorption rate due to dew condensation on the walls of the adsorbers 1 and 2, a temporary decrease in the system COP due to an increase in heat consumption, and dew condensation on the adsorbent itself There was a risk that deteriorating substances would adhere to the adsorbent due to the adhesion of water.

Therefore, in the refrigeration system of the present embodiment, the purpose of preventing dew condensation inside the refrigeration system, and also that malfunction due to dew condensation on functional components such as check valves 21 to 24 mounted in the refrigeration cycle is prevented. The purpose is to prevent performance degradation due to a decrease in the degree of vacuum inside the refrigeration cycle caused by hydrogen generation due to contact between the metal used and the condensed water, etc., and the condensed water adheres to the adsorbent itself. The above-described configuration is provided for the purpose of preventing the occurrence of problems such as deterioration substances adhering to the adsorbent.
That is, in the refrigeration system of this embodiment, when the operation is stopped, the refrigerant tank 5 for recovering the refrigerant inside the refrigeration cycle, and the electromagnetic on-off valve 6 that opens when returning the refrigerant from the refrigeration cycle to the refrigerant tank 5. In other words, in order to equalize the pressure in the evaporator 4 and the pressure in the refrigerant tank 5, an electromagnetic pressure equalizing valve 7 that opens when returning the refrigerant from the refrigeration cycle to the refrigerant tank 5, and a refrigeration system At the start of operation, when returning the refrigerant from the refrigerant tank 5 to the refrigeration cycle, an electric heater 8 for heating the refrigerant in the refrigerant tank 5 is used to make the pressure in the refrigerant tank 5 higher than the pressure in the evaporator 4. It has an additional installation configuration.
Therefore, in the conventional adsorption system, the refrigerant remains in the refrigeration cycle. On the other hand, in the refrigeration system of the present embodiment, a conventional refrigerant tank 5 is installed separately from the refrigeration cycle except during operation, and unnecessary refrigerant is stored therein when operation is stopped, thereby eliminating the conventional problems. And reduction.

As described above, in the refrigeration system of the present embodiment, refrigerant desorption control (adsorbent drying control) that desorbs refrigerant from the adsorbents of the two first and second adsorption cores 1a and 2a when the operation is stopped. If it is determined that the operation is completed, the operation of the refrigerant recovery means is controlled. Specifically, ON / OFF switching control is performed on the first and second four-way valves 27 and 28, the electric hot water pump 31, the electric cooling water pump 32, and the electric cold water pump 34 are turned OFF, and the electric cooling water is supplied. The pump 33 is turned on. Further, the refrigerant recovery control is executed by opening both the electromagnetic on-off valve 6 and the electromagnetic pressure equalizing valve 7 and opening them.
When the refrigerant recovery control is started, the refrigerant desorbed from the adsorbent and present in the refrigeration cycle, for example, the refrigerant in the two first and second adsorbers 1 and 2, the refrigerant in the condenser 3, and the evaporator 4 In the supply pipes 11 to 16) gathers in the supply pipe 18 and flows into the refrigerant tank 5 through the pipe 41.

Thereby, since the refrigerant in the refrigeration cycle is collected in the refrigerant tank 5, the refrigerant in the refrigeration cycle can be stored in the refrigerant tank 5 while the operation of the refrigeration system is stopped.
The refrigerant tank 5 for recovery, the electromagnetic on-off valve 6 that opens when returning the refrigerant from the refrigeration cycle to the refrigerant tank 5, that is, the pressure in the evaporator 4 and the pressure in the refrigerant tank 5 are equalized. Therefore, even if the temperature of the electric internal device that opens when returning the refrigerant from the refrigeration cycle to the refrigerant tank 5 becomes lower than the outside temperature, the refrigerant in the refrigeration cycle is transferred to the refrigerant tank 5. Since it can be recovered, there is no refrigerant inside the refrigeration cycle.
Therefore, the dew condensation inside the refrigeration cycle when the operation of the refrigeration system is stopped can be prevented, so that a delay in rising at the start of operation of the refrigeration system can be suppressed. Thereby, the refrigerating capacity at the time of starting of a refrigerating system can be improved.
In addition, “malfunctions of check valves 21 to 24 that are functional components of the refrigeration cycle”, “performance degradation due to hydrogen generation due to contact between metal used in the refrigeration cycle and condensed water”, “first, “Decrease in refrigeration capacity at startup due to decrease in initial desorption rate due to dew condensation on second adsorption cores 1a, 2a”, “temporary decrease in system COP due to increase in heat consumption”, “dew condensation water adheres to adsorbent itself As a result, various problems such as “occurrence of defects such as deterioration substances adhering to the adsorbent” can be solved.

Further, the operation of the refrigerant charging means is controlled at the start of operation of the refrigeration system. Specifically, the refrigerant on / off valve 6 is turned on to open the valve, the electromagnetic pressure equalizing valve 7 is turned off to close the valve, and the electric heater 8 is turned on to execute the refrigerant charging control.
When the refrigerant charging control is started (implemented), the pressure in the refrigerant tank 5 becomes higher than the pressure in the evaporator 4. Thus, when the pressure in the refrigerant tank 5 becomes higher than the pressure in the evaporator 4, the liquid refrigerant in the refrigerant tank 5 is pushed out to the supply pipe 18 through the pipe 41 and flows into the evaporator 4.
As a result, the liquid refrigerant in the refrigerant tank 5 is returned to the evaporator 4 having a pressure lower than that of the refrigerant tank 5, so that the refrigerant in the refrigerant tank 5 does not remain in the refrigerant tank 5 and the refrigeration cycle. Can be filled. Therefore, even in the refrigeration system that collects the refrigerant in the refrigerant tank 5 outside the refrigeration cycle when the operation is stopped, the refrigerant charging amount in the refrigeration cycle does not become insufficient, and a reduction in the refrigeration capacity of the refrigeration cycle can be prevented. .
When the inlet port (or inlet channel pipe) of the evaporator 4 is arranged so that the liquid refrigerant blown into the evaporator 4 with pressure is blown to the heat exchanger 26 in the evaporator 4, a refrigerant tank It is also possible to ensure the cooling performance from a small amount of refrigerant returned from 5 to the refrigeration cycle.

[Configuration of Example 2]
FIG. 4 shows a second embodiment of the present invention.
Here, the same reference numerals as those in the first embodiment form the same configuration or function, and a description thereof will be omitted.

In the inside of the refrigerant tank 5 of the present embodiment, a heat exchange medium (fluid) such as hot water or cooling water is circulated and supplied from the heating medium or cooling medium supply means of the first embodiment instead of the electric heater 8 of the first embodiment. A heat exchanger 9 is accommodated.
The heat exchanger 9 heats the refrigerant collected in the refrigerant reservoir 36 of the refrigerant tank 5 for the purpose of making the pressure in the refrigerant tank 5 higher than the pressure in the evaporator 4 at the start of operation of the refrigeration cycle. This is a refrigerant heating means.
The refrigerant tank 5 is connected to an inlet channel pipe 51 for introducing a fluid into the heat exchanger 9 and an outlet channel pipe 52 for leading the fluid from the heat exchanger 9.
Further, the heating medium or cooling medium supply means has a fluid supply channel pipe 53 extending from a branch portion of the hot water or cooling water circulation path and a fluid return channel pipe 54 extending to a junction of the hot water or cooling water circulation path. .
A third four-way valve 55 that is an electromagnetic switching valve for switching a fluid circulation path is installed between the inlet channel pipe 51 and the outlet channel pipe 52, the fluid supply channel pipe 53, and the fluid return channel pipe. Yes.

In the present embodiment, when the third four-way valve 55 is set to the solid line position in FIG. 4, the fluid circulates through the heat exchanger 9. Further, when the third four-way valve 55 is set at the position of the broken line in FIG. 4, the fluid does not circulate through the heat exchanger 9.
The third four-way valve 55 is energized and controlled by the air conditioning ECU 10.
The air conditioning ECU 10 turns on the electromagnetic on-off valve 6 to open it at the start of operation of the refrigeration system, turns off the electromagnetic pressure equalizing valve 7 and closes it, and turns on the third four-way valve 55 to fill the refrigerant. Control is executed. As a result, the third four-way valve 55 is set at the solid line position in FIG. 4, so that the liquid refrigerant is heated by the fluid flowing through the heat exchanger 9, so that the pressure in the refrigerant tank 5 is the same as in the first embodiment. The pressure in the evaporator 4 becomes higher and the refrigerant in the refrigerant tank 5 is returned to the refrigeration cycle.

As described above, the refrigeration system of the present embodiment has the same effects as those of the first embodiment. Furthermore, instead of the electric heater 8 of the first embodiment, the first and second adsorption cores 1a and 2a of the refrigeration system are provided. The liquid refrigerant is heated using warm water or cooling water flowing to the refrigerant, and the pressure in the refrigerant tank 5 is made higher than the pressure in the evaporator 4, thereby reducing power consumption during refrigerant charging control.
Note that, during the refrigerant charging control, the third four-way valve 55 is turned on and set to the position indicated by the solid line in FIG. 4, so that warm water or cooling water flows through the heat exchanger 9. Further, when the refrigerant charging control is completed or when heating of the refrigerant is unnecessary, the third four-way valve 55 is turned off and set to the position of the broken line in FIG. It connects with the channel pipe 52. In this way, when not necessary, the inside of the refrigerant tank 7 is not heated.

[Configuration of Example 3]
FIG. 5 shows a third embodiment of the present invention.
Here, the same reference numerals as those in the first embodiment form the same configuration or function, and a description thereof will be omitted.

Between the supply pipes 15 and 16 of the refrigeration cycle of the present embodiment, a normally closed steam shut valve (hereinafter referred to as an electromagnetic on-off valve) 17 that opens when supplied with electric power is installed.
The electromagnetic on-off valve 17 has a valve seat (valve seat) in which a flow path hole (a valve hole communicating a flow path formed in the supply pipe 15 and a flow path formed in the supply pipe 16) is formed. , A poppet valve that opens and closes the flow path hole, a spring that biases the poppet valve in the valve closing direction, and an electromagnetic actuator that drives the poppet valve in the valve opening direction. The electromagnetic actuator includes a solenoid having a coil that generates a magnetic force when energized.
When the solenoid coil is energized (turned on), the poppet valve of the electromagnetic on-off valve 17 is detached from the valve seat and opens the valve hole (fully opened) when the energization to the solenoid coil is stopped (off). . The poppet valve of the electromagnetic on-off valve 17 is seated on the valve seat and closes (fully closes) the valve hole.
The electromagnetic on-off valve 17 is energized and controlled by the air conditioning ECU 10.

Moreover, the condenser 3 is arrange | positioned so that the refrigerating cycle may be located below the gravity direction lowermost part (bottom surface) of the evaporator 4 in the gravity direction.
The condenser 3 also serves as a liquid tank that stores liquid refrigerant when the operation of the refrigeration system is stopped. Inside the condenser 3 is formed a refrigerant reservoir 19 that can recover a predetermined amount of refrigerant in the refrigeration cycle. The refrigerant reservoir 19 is provided on the bottom surface, which is the lowest part of the condenser 3 in the direction of gravity. In addition, the refrigerant reservoir 19 is arranged such that the liquid refrigerant surface level when the refrigerant recovery control is completed is positioned below the bottom surface of the evaporator 4 in the direction of gravity.
The condenser 3 has an internal volume capable of storing a predetermined amount of refrigerant including refrigerant vapor. Thereby, a gas phase space in which the refrigerant vapor stays is formed above the liquid level of the refrigerant collected in the refrigerant storage unit 19.

Here, an outlet port opened on the side surface of the condenser 3 is formed below the side of the condenser 3. The outlet port of the condenser 3 is connected to the inlet port of the evaporator 4 via a supply pipe 18.
An inlet port opened at the bottom of the evaporator 4 is formed at the bottom of the evaporator 4. The inlet port of the evaporator 4 is connected to the outlet port of the condenser 3 via a supply pipe 18. The supply pipe 18 includes a function as a first communication pipe (41) that communicates the refrigerant reservoir 19 of the condenser 3 and the inlet port of the evaporator 4. In the middle of the supply pipe 18, the electromagnetic opening / closing valve 6 is installed.
Further, the refrigeration system (refrigerant recovery means) includes a pipe (second communication pipe) 42 that communicates the condenser 3 and the evaporator 4. In the middle of the pipe 42, the electromagnetic pressure equalizing valve 7 is installed.

As described above, in the refrigeration system of the present embodiment, the refrigerant storage unit 19 of the condenser 3 is replaced with the refrigeration cycle when the operation of the refrigeration system is stopped instead of the refrigerant storage unit 36 of the refrigerant tank 5 of the first and second embodiments. It is configured to substitute as a liquid tank for collecting the refrigerant inside.
The basic operation is the same as in the first embodiment.
That is, when the operation of the refrigeration cycle is stopped, similarly to the control routine of FIG. 2, the operation of the refrigerant detachment unit is controlled to execute the refrigerant detachment control. When the refrigerant detachment control is completed, the operation of the refrigerant recovery unit is controlled. The refrigerant recovery control is executed. As a result, the refrigerant in the refrigeration cycle is collected in the refrigerant reservoir 19 of the condenser 3. After the refrigerant recovery control is completed, the refrigerant can be stored in the refrigerant reservoir 19 by turning off and closing all of the electromagnetic on-off valve 6, the electromagnetic pressure equalizing valve 7, and the electromagnetic on-off valve 17.

Further, at the start of the operation of the refrigeration cycle, the refrigerant charging control is executed by controlling the operation of the refrigerant charging means. At this time, since all the control devices used during the normal operation of the refrigeration system are in an operating state, both the electromagnetic on-off valve 6 and the electromagnetic on-off valve 17 are turned on to open, and the electromagnetic pressure equalizing valve 7 is turned off to close the valve. By doing so, the pressure in the condenser 3 becomes higher than the pressure in the evaporator 4. Thereby, the refrigerant in the condenser 3 is pushed by the pressure, flows out from the outlet port of the condenser 3, flows into the evaporator 4 having a low pressure through the supply pipe 18, and the cooling capacity is generated.
Thereafter, even if the air conditioning ECU 10 determines that the refrigerant charging control is completed, the open states of the electromagnetic on-off valve 6 and the electromagnetic on-off valve 17 are continued.
Note that the electromagnetic on-off valve 6 and the electromagnetic on-off valve 17 are maintained in the open state even during the refrigerant desorption control. As described above, in the refrigeration system of the present embodiment, the same effects as those of the first embodiment can be achieved.

[Modification]
In this embodiment, the refrigeration system of the present invention is applied to an adsorption refrigeration system (refrigerator) that obtains the refrigeration capacity of a vehicle air conditioner or a stationary air conditioner. The present invention may be applied to a freezing or refrigeration apparatus for use or an adsorption refrigeration system (refrigerator) that obtains a freezing capacity of a stationary refrigeration or refrigeration. Moreover, you may utilize the fluid (heat exchange medium) heat-exchanged in the condenser 3 as a heat source of a vehicle heating apparatus, a stationary heating apparatus, or a hot-water supply apparatus.
In this embodiment, as the heating medium (warm water), the cooling medium (cooling water), and the heat exchange medium (cold water), a fluid in which ethylene glycol-based antifreeze is mixed with water is used. The fluid may be used.

In this embodiment, water vapor or water is used as a gaseous refrigerant (refrigerant vapor) or a liquid refrigerant (liquid refrigerant). However, an alcohol or an alcohol-based aqueous solution is used as a gaseous refrigerant or a liquid refrigerant. May be used.
Here, there is also a method in which at least one adsorbing core is always heated and stored as a method that enables only performance maintenance during start-up (start-up) of the refrigeration system and prevention of adhesion of a deteriorating substance to the adsorbent.
The heating source allows hot water to flow intermittently, but by attaching an electric heater to the adsorption core and always maintaining it at a temperature higher than the outside air temperature, condensation on the adsorption core can be prevented.
Further, when the refrigerant recovery control by the air conditioning ECU 10 is completed, an adsorption core having an adsorption capacity equal to or larger than the amount of remaining refrigerant remaining in the refrigeration cycle may be used.

DESCRIPTION OF SYMBOLS 1 1st adsorber 2 2nd adsorber 3 Condenser 4 Evaporator 5 Refrigerant tank (refrigerant recovery part)
6 Electromagnetic on-off valve (first on-off valve)
7 Electromagnetic equalizing valve (second on-off valve)
8 Electric heater (refrigerant heating means)
9 Heat exchanger (refrigerant heating means)
10 Air-conditioning ECU (refrigerant recovery control means, refrigerant desorption control means, refrigerant charging control means)
15 Supply piping (refrigerant supply piping)
16 Supply piping (refrigerant supply piping)
17 Electromagnetic on-off valve (third on-off valve)
18 Supply piping (refrigerant supply piping)
19 Refrigerant reservoir 21 Check valve (functional part of refrigeration cycle)
22 Check valve (functional part of refrigeration cycle)
23 Check valve (functional part of refrigeration cycle)
24 Check valve (functional part of refrigeration cycle)
31 Electric hot water pump (heating medium supply means)
32 Electric cooling water pump (cooling medium supply means)
33 Electric cooling water pump (refrigerant cooling means, heat exchange medium supply means)
34 Electric cold water pump (heat exchange medium supply means)
36 Refrigerant storage part 41 Piping (first communication pipe)
42 Piping (second communication pipe)
1a 1st adsorption core 2a 2nd adsorption core

Claims (18)

An adsorber containing an adsorbing core provided with an adsorbent for adsorbing and desorbing refrigerant; and
A condenser that cools and condenses the refrigerant from which the adsorption core is desorbed;
In a refrigeration system comprising an evaporator that evaporates the refrigerant liquefied by this condenser and exhibits refrigeration capacity,
The refrigeration system includes:
(A) a refrigeration cycle having a refrigerant supply path for supplying refrigerant from the evaporator through the adsorber to the condenser;
(B) a refrigerant tank disposed so as to be located below the gravity direction lowermost part of the refrigeration cycle in the gravity direction and capable of recovering a predetermined amount of refrigerant in the refrigeration cycle;
(C) Refrigerant recovery means for executing refrigerant recovery control for recovering the refrigerant in the refrigeration cycle to the refrigerant tank;
(D) A refrigeration system comprising: refrigerant recovery control means for controlling the operation of the refrigerant recovery means when the operation of the refrigeration system is stopped. The refrigeration system of claim 1,
The evaporator is arranged such that the lowermost part in the gravitational direction is located below the lowermost gravitational direction of the condenser in the gravitational direction,
The refrigeration system, wherein the refrigerant tank is arranged such that a refrigerant liquid level when the refrigerant recovery control is completed is located below a gravity direction lowermost part of the evaporator in a gravity direction. The refrigeration system according to claim 2,
The refrigeration cycle has a refrigerant supply pipe for supplying a refrigerant from the condenser to the evaporator. The refrigeration system according to claim 3,
The refrigerant recovery means includes a refrigerant cooling means that cools the refrigerant in the condenser, a first communication pipe that connects the refrigerant supply pipe or the lowermost gravitational direction of the evaporator and the refrigerant tank, the refrigerant tank, A refrigeration system comprising: a second communication pipe that communicates with an evaporator; a first on-off valve that opens and closes the first communication pipe; and a second on-off valve that opens and closes the second communication pipe. The refrigeration system according to claim 3 or claim 4,
The refrigeration system includes:
Refrigerant desorption means for performing refrigerant desorption control for desorbing the refrigerant from the adsorption core;
A refrigeration system comprising refrigerant desorption control means for controlling the operation of the refrigerant desorption means before the refrigerant recovery control. The refrigeration system according to claim 5,
The refrigerant desorption means includes a heating medium supply means for supplying a heating medium for heating the adsorption core into the adsorber, and a refrigerant cooling means for cooling the refrigerant in the condenser. Refrigeration system. The refrigeration system according to any one of claims 2 to 6,
The refrigeration system includes:
Refrigerant filling means for performing refrigerant filling control for filling the refrigerant in the refrigerant tank into the refrigeration cycle;
A refrigeration system comprising: a refrigerant charging control unit that controls an operation of the refrigerant charging unit at the start of operation of the refrigeration system. The refrigeration system according to claim 7,
The refrigerant filling means includes a heating medium supply means for supplying a heating medium for heating the adsorption core into the adsorber, a cooling medium supply means for supplying a cooling medium for cooling the adsorption core into the adsorber, and the condensation A refrigerant cooling means for cooling the refrigerant in the container, a refrigerant heating means for heating the refrigerant in the refrigerant reservoir, a first communication pipe for communicating the refrigerant supply pipe or the lowermost gravitational direction of the evaporator with the refrigerant tank, And a refrigeration system having a first on-off valve for opening and closing the first communication pipe. The refrigeration system according to claim 8,
A refrigeration system using a heating medium used in the heating medium supply means as a heating source of the refrigerant heating means. An adsorber containing an adsorbing core provided with an adsorbent for adsorbing and desorbing refrigerant; and
A condenser that cools and condenses the refrigerant from which the adsorption core is desorbed;
In a refrigeration system comprising an evaporator that evaporates the refrigerant liquefied by this condenser and exhibits refrigeration capacity,
The condenser is disposed so as to be located below the gravity direction lowermost part of the evaporator in the gravity direction, and has a refrigerant storage part capable of recovering a predetermined amount of the refrigerant in the refrigeration cycle,
The refrigeration system includes:
(A) a refrigeration cycle having a refrigerant supply path for supplying refrigerant from the evaporator through the adsorber to the condenser;
(B) Refrigerant recovery means for executing refrigerant recovery control for recovering the refrigerant in the refrigeration cycle to the refrigerant reservoir;
(C) A refrigeration system comprising refrigerant recovery control means for controlling the operation of the refrigerant recovery means when the operation of the refrigeration system is stopped. The refrigeration system of claim 10,
The refrigeration system, wherein the refrigerant storage unit is arranged such that a refrigerant liquid level when the refrigerant recovery control is completed is positioned below a gravity direction lowermost part of the evaporator. The refrigeration system of claim 11,
The refrigerant recovery means includes a refrigerant cooling means for cooling the refrigerant in the condenser, a first communication pipe that communicates the refrigerant reservoir and the evaporator, and a second communication that communicates the condenser and the evaporator. A refrigeration system comprising: a pipe, a first on-off valve that opens and closes the first communication pipe, and a second on-off valve that opens and closes the second communication pipe. The refrigeration system according to claim 11 or 12,
The refrigeration system includes:
Refrigerant desorption means for performing refrigerant desorption control for desorbing the refrigerant from the adsorption core;
A refrigeration system comprising refrigerant desorption control means for controlling the operation of the refrigerant desorption means before the refrigerant recovery control. The refrigeration system of claim 13,
The refrigerant desorption means includes a heating medium supply means for supplying a heating medium for heating the adsorption core into the adsorber, and a refrigerant cooling means for cooling the refrigerant in the condenser. Refrigeration system. The refrigeration system according to any one of claims 11 to 14,
The refrigeration system includes:
Refrigerant filling means for performing refrigerant filling control for filling the refrigerant in the refrigerant tank into the refrigeration cycle;
A refrigeration system comprising: a refrigerant charging control unit that controls an operation of the refrigerant charging unit at the start of operation of the refrigeration system. The refrigeration system of claim 15,
The refrigerant filling means includes a heating medium supply means for supplying a heating medium for heating the adsorption core into the adsorber, a cooling medium supply means for supplying a cooling medium for cooling the adsorption core into the adsorber, and the condensation It has a refrigerant cooling means for cooling the refrigerant in the vessel, a first communication pipe for communicating the refrigerant reservoir and the evaporator, and a first on-off valve for opening and closing the first communication pipe. Refrigeration system. The refrigeration system according to any one of claims 1 to 16,
The refrigeration system, wherein the adsorber includes an adsorption core heating unit that heats the adsorption core so that a temperature of the adsorption core is higher than an outside air temperature. The refrigeration system according to any one of claims 1 to 17,
The refrigeration system, wherein the adsorption core has an adsorption capacity equal to or greater than the amount of remaining refrigerant remaining in the refrigeration cycle when the refrigerant recovery control is completed.

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